- new Comment class

- improved performances (much less duplicated mysql queries)
- less code and better error handling
- informs the whole thread when posting new comment
- fix various bugs

tables/appdb_tables.sql

@@ -137,13 +137,11 @@ create table appComments (
 	time		datetime,
 	commentId	int not null auto_increment,
 	parentId	int default 0,
-	appId		int not null,
-	versionId	int default 0,
+	versionId	int not null,
 	userId		int,
 	hostname	varchar(80),
 	subject		varchar(128),
 	body		text,
-	score		int,
 	key(commentId),
 	index(appId),
 	index(versionId)